1  2  3  4 

1  _  _  _  _

2  _  _  _  _

3  _  _  _  _

4  _  _  _  _


ACROSS
1)  get ____ or ____er
2)  the chief solid component of mammalian urine; synthesized from ammonia and carbon dioxide and used as fertilizer and in animal feed and in plastics
3)  move as if through a sieve
4)  a framework that holds the panes of a window in the window frame


DOWN
1)  a person who is physically weak and ineffectual
2)  an elaborate song for solo voice
3)  (sports) the chief official (as in boxing or american football) who is expected to ensure fair play
4)  a science (or group of related sciences) dealing with the logic of quantity and shape and arrangement

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